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تغییر شکل پلاستیک ورق‌های چندلایه فلزی هم‌جنس و غیر هم‌جنس با چگالی سطحی ثابت تحت بارگذاری دفعی مکرر | ||
| مکانیک هوافضا | ||
| مقاله 9، دوره 18، شماره 1 - شماره پیاپی 67، خرداد 1401، صفحه 137-159 اصل مقاله (2.63 M) | ||
| نوع مقاله: مکانیک ضربه | ||
| نویسندگان | ||
| مجتبی ضیاء شمامی1؛ هاشم بابایی* 2؛ توحید میرزابابای مستوفی3؛ حسین خدارحمی4 | ||
| 1پژوهشگر، دانشکده فنی مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
| 2نویسنده مسئول: دانشیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، گیلان، ایران | ||
| 3استادیار، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران | ||
| 4استاد، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران | ||
| تاریخ دریافت: 26 مرداد 1400، تاریخ بازنگری: 18 مهر 1400، تاریخ پذیرش: 24 مهر 1400 | ||
| چکیده | ||
| در پژوهش حاضر، مکانیسم تغییر شکل بزرگ پلاستیک ورق‌های دایره‌ای تک و چندلایه فلزی هم‌جنس و غیر هم‌جنس با چگالی سطحی ثابت تحت بارگذاری دفعی مکرر یکنواخت موردبررسی قرارگرفته است. از سامانه پاندول بالستیک به همراه لوله استقرار خرج 200 میلی‌متری برای اعمال بار انفجاری به نمونه استفاده شد. 40 نمونه آزمایشی در سه لایه‌بندی مختلف تک، دو و سه لایه با هشت چیدمان مختلف در نظر شد. برای ایجاد شرایط بارگذاری و آزمایشی یکسان، از 10 گرم ماده منفجره پلاستیکی استفاده شد و پاسخ دینامیکی هر سازه تا 5 بار بارگذاری مکرر موردمطالعه قرار گرفت. نتایج آزمایشگاهی حاکی از تغییر شکل بزرگ پلاستیک همراه با نازک شدگی در مرزهای گیردار و همچنین پاره شدن برخی آزمایش‌ها است. همچنین نتایج نشان داد که با افزایش تعداد دفعات انفجار، بیشترین خیز دائمی ورق‌ها افزایش می‌یابد و با افزایش تعداد انفجارها، خیز پیش‌رونده ورق در مرکز آن به‌صورت نمایی کاهش می‌یابد. علاوه بر این، قرارگیری یک لایه ضخیم در جلو و پشتیبانی یک سازه با لایه نازک‌تر عملکرد بهتری به نمونه آزمایشی در برابر بار انفجاری مکرر می‌بخشد. نتیجه به‌دست‌آمده برای ساختارهای چندلایه هم‌جنس کاملاً مطابق با نتایج ساختارهای غیر هم‌جنس است. | ||
| کلیدواژه‌ها | ||
| بارگذاری مکرر؛ بارگذاری دفعی؛ ساختار چندلایه غیر هم‌جنس؛ ورق دایره‌ای؛ خیز حداکثر | ||
| عنوان مقاله [English] | ||
| Plastic Deformation of Similar and Dissimilar Multi-layered Metallic Plates with the Same Areal Density Subjected to Repeated Impulsive Loading | ||
| نویسندگان [English] | ||
| Mojtaba Ziya-Shamami1؛ Hashem Babaei2؛ Tohid Mirzababaie Mostofi3؛ Hossein Khodarahmi4 | ||
| 1Researcher, Faculty of Technical Engineering, Imam Hossein University, Tehran, Iran | ||
| 2Corresponding author: Associate Professor, Faculty of Mechanical Engineering, Gilan University, Gilan, Iran | ||
| 3Assistant Professor, Faculty of Mechanical Engineering, Ivankay University, Ivankay, Iran | ||
| 4Professor, Faculty of Mechanical Engineering, Ivankay University, Ivankay, Iran | ||
| چکیده [English] | ||
| In the current research study, the large plastic deformations of similar and dissimilar single- and multi-layered metallic plates with the same areal density under repeated uniform impulsive loading have been investigated. The ballistic pendulum along a 200 mm length standoff blast tube was used to apply the blast load on the specimen. Forty testing specimen in three different layering configurations including single-, double, and triple-layered, and eight different arrangements were considered. For the same loading and experimental condition, 10 g plastic explosive was utilized and the dynamic response of structures was studied up to five consecutive loads. The experimental results indicated large plastic global deformation with thinning happening at the clamped boundary and also tearing for some experiments. The results also represented that the maximum permanent deflections of plates were increased by the number of blast loads and the progressive deflection of the plates at the center was decreased exponentially with increasing the number of blasts. Placing a thick front layer a thin back layer gives better blast performance to the tested specimen against repeated impulsive loading. The obtained result for multi-layered configurations with the same material is completely consistent with those structures made of dissimilar layers. | ||
| کلیدواژه‌ها [English] | ||
| Repeated loading, Impulsive loading, Multi-layered mixed configuration, Circular plate, Maximum displacement | ||
| مراجع | ||
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On dimensionless numbers for predicting large ductile transverse deformation of monolithic and multi-layered metallic square targets struck normally by rigid spherical projectile. Thin-Walled Structures. 2017;112:118-24.## [28] Babaei H, Mostofi TM, Namdari-Khalilabad M, Alitavoli M, Mohammadi K. Gas mixture detonation method, a novel processing technique for metal powder compaction: Experimental investigation and empirical modeling. Powder Technology. 2017;315:171-81.## [29] Jamali A, Babaei H, Nariman-Zadeh N, Ashraf Talesh S, Mirzababaie Mostofi T. Multi-objective optimum design of ANFIS for modelling and prediction of deformation of thin plates subjected to hydrodynamic impact loading. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 2020;234(3):368-78.## [30] Babaei H, Mostofi TM, Alitavoli M, Namazi N, Rahmanpoor A. Dynamic compaction of cold die Aluminum powders. Geomechanics and Engineering. 2016;10:109-24.## | ||
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